Build

full cmake 2/N: integral classes and AM configuration #940

Job	Run time
Repo • macos-latest: clang++ Release	10m 45s
Repo • ubuntu-20.04: g++-10 Release	27m 10s
Repo • macos-latest: clang++ Debug	7m 35s
Repo • ubuntu-20.04: g++-10 Debug	21m 17s
Export • ubuntu-gnu	13m 1s
Export • windows-clang-cl	16m 23s
Export • macos-clang	16m 43s
Export • ubuntu-intel	17m 42s
	2h 10m 36s

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